I believe the answer is 2: multiple ecosystems in a biome
Answer:
Bone strength is influenced by changes in the structure (size and shape) and composition [cortical (compact) bone, trabecular (sponge-like) bone, amount of cartilage] of the bone. 6 A high peak mass at a young age and the decrease of bone loss at a later age are two ways to reduce osteoporosis risk.
Explanation:
Motor skills
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Perihelion marks the begging of summer when the earth is closest to the sun.
